Lubrication of parts rotating at high speed



June 23, 1925. 1,543,155

c. FRADET LUBRICATION OF PARTS ROTATING AT HIGH SPEED Filed April' 20,1922 INVENTOR ATTORNEY l atentcd dame 21$, i f m a at? S r GEAZREJESFPdkDEP, 0F ASNIEREfi, FRANCE, ASSI GNOR T0 WALTER fififilh LEE,ASNIERES, FRANCE.

EIJUZBRICATIQN 0F PARTS RUI'ATEIG- AT HIGH SPEED Application filed April29, 1922. Serial No. 555,689.

To a-ZZ whom it may camera:

Be it known that l, @HARLES FnAnn'r, a citizen of the French Republic,and a resident of Asnieres. Seine, France, have invented new and usefulImprovements in the Lubrication of Parts Rotating at High Speed, 0rwhich the following is a specification.

This invention relates to means for effecting lubrication of thecontacting surfaces ct rotary pumps and the like of the radially movingvane type, the vanes being carried by a rotor, and the outer ends of thevanes normally'engaging the inner surface of the cylinder or stator. Tothis end, theinvention contemplates the provision of the forward edgeofthe contacting surface of the respective vanes with a beveled surface,either plain or curved, the angle of the bevel being greater than themaximum angle formed by the normal to the vane and the tangent to thesurface of the stator with which the vane contacts, the difierencebetween the angles being such that oil is caused to pass under pressurebetween the contacting surfaces.

The invention is illustrated in the accompanying drawings, in which:

1 is a diagrammatic sectional elevation of a rotary pump involving theinvention.

Fig. 2 is an enlarged detail View of the outer end of the vane whichengages the stator surface.

Fig. 3 is a similar view showing a. modified form of beveled edge of thevane.

Referring to Figs. 1 and 2 of the drawings, 7* indicates the rotormember of the pump, compressor or similar apparatus, in which is mountedthe radially movable vane a, the outer edge of which engages thecylindrical wall of the stator 0?. The outer and forward edge of thevane a, with reference to the direction of movement.- of the vane, isbeveled by cutting away a section represented by the prism'definedbetween the lines cc. 0g, and e-g, so that the angle m is greater, forall positions of the rotor, than the angle m, said angle m being thatdefined bet-ween lines en, which is normal to the longitudinal axis ofthe vane a, and the line ec', which is tangent to the circle definingthe wall (i of the stator at point c, and the angle a" being thatincluded between the normal to the vane c% and line cm defining thebeveled surface e-g. The angle 99 is a maximum when the point e of thevane engages point h of the stator, as indicated in Fig. 1, which pointit is the intersection of the circumference (i of the stator and theperpendicular to the middle of line between points 0 and 0', which arethe centers. of the stator and rotor axes, respectively, lln otherwords, the angle 122 between lines /t0 and h0 indicates the maximumvalue of angle a, and in all'cases the angle 9: mustbe greater thanangle 0 2. The difference of these two angles is such that the oil.which is on the surface of the stator 05, owing to its lnertia, issubjected during the operation of the machine to a pressure forcing itbetween the contacting surface of the stator (Z and the end of the vanea, thus forming a lubricating film which is not scraped off by therotary movement of the. vane. This pressure increases with the speed ofthe rotor, consequently with the centrifuga force, and balances thelatter, and generally all those forces tending to move the vane intoengagement with the stator.

Obviously the plain or prismatic surface he o on the outer end of thevane may be replaced by a curved surface, as illustrated in Fig. 3, thegenerating curve being inscribed in the angle 7)-c the resultant curvedand beveled forward edge of the ram serving the same purpose and effectas the plain beveled surface or edge, as indicated 'in Fig. 2.

hat I claim is: V

1. Means for effecting lubrication of the contactingsurfaces of rotarypumps and the like ofthe radially moving vane type. which comprisesvanes each having the forward edge of its surface engaging the statorwall beveled to an angle greater than the maxi mum angle formed by thenormal to the vane and the tangent to the surface with which the vanecontacts, whereby the lubricant is forced under pressure between thesurfaces in contact.

2. Means as set forth in claim 1 in which the beveled forward edge ofthe respective vanes is a curved surface.

ln testimony whereof I have signed my name to this specification.

CHARLES FRADET.

